A lot of people wants to immigrate to the west to better their lives, and christians know that they will receive a wormer welcome than others in Christian societies so they chose (mostly) or are forced by conflicts and circumstances.
A UN recognized state for the frontiers of 1948 which is 1/4th or less of the current state, ask the Usraelis if they will accept that.
They want the 1967 frontiers with the Syrian Golan heights, plus the blockading and control of the West bank and Gaza, and that is not acceptable to the Arabs.
You can call the Palestinians terrorists or whatever you chose, just remember that the majority of the world's population sees them as people fighting for their freedom, and this majority is more than 6 billion on the 7 billion world population including many in the Wester remaining 1 billion who coins them as terrorists, the majority of the countries who were once colonized sympathizes naturally with the Palestinians, and that is what I mean with the majority of the world's population.